Fig. 5

Range of motion (ROM) in flexion-extension at each motion segment for each rod type. Control non-instrumented condition, and with dual rods of polyetheretherketone (PEEK), Titanium, and Cobalt-Chrome alloy (CoCr) are shown. The instrumented levels spanned T3-T4 through T10-T11. Ceph-T3 indicates the proximal adjacent level, and T11-REF the distal adjacent level